Completion of command names and variables

New completion entry functions for readline specific code:
  - compl_var for variables
  - compl_fn for functions
  - compl_builtin for builtins
  - compl_extcmd for external commands in path
  - compl_command, which combines the last three

The first three are simple wrappers for compl_name, which iterates over a
typical rc table (an array of structs) yielding the name fields.

The appropriate completion entry function is chosen based on the
character/token that preceeds the word to complete: '$' for variable,
beginning of line or one of [`@|&(){;] for command. Otherwise the shell falls
back to readline's default completion, which it also does, if the chosen
completion entry function finds no match.

1 files changed, 5 insertions, 0 deletions

diff --git a/builtins.c b/builtins.c
index 42411ef..5a45435 100644
--- a/builtins.c
+++ b/builtins.c
@@ -636,3 +636,8 @@ static void b_limit(char **av) {
 	}
 }
 #endif
+
+extern char *compl_builtin(const char *text, int state) {
+	return compl_name(text, state, &builtins[0].name, arraysize(builtins), &builtins[1].name - &builtins[0].name);
+}
+